Discovery of a novel series of biphenyl benzoic acid derivatives as highly potent and selective human beta3 adrenergic receptor agonists with good oral bioavailability. Part II

J Med Chem. 2008 Jul 10;51(13):4002-20. doi: 10.1021/jm8000345. Epub 2008 Jun 14.


The left-hand side (LHS) and central part of our first generation biphenyl (FGB) series was modified to improve in vitro and in vivo beta3-AR potency without loss of oral bioavailability. First, in this study, we focused our efforts on replacement of the 3-chlorophenyl moiety in the LHS of FGB analogues with 3-pyridyl ring analogues to adjust the lipophilicity. Second, we investigated the replacement of the central part of this series and discovered that introduction of a methyl group into the alpha-position of the phenethylamine moiety greatly enhanced potency keeping good oral availability. Finally, the replacement of the two carbon linker of the central part with an ethoxy-based linker provided improved potency and PK profiles. As a result of these studies, several analogues (i.e., 9h, 9k, 9l, 10g, 10m, 10p, 10r, 11b, and 11l) were identified that displayed an excellent balance of very higher human beta3-AR potency compared to the FGB compounds, high selectivity, and good pharmacokinetic profiles. Furthermore, these several compounds showed high in vivo efficacy in an overactive bladder (OAB) model. These findings suggest that our selected second generation biphenyl (SGB) series compounds may be attractive new successful therapeutic candidates for the treatment of OAB.

MeSH terms

  • Administration, Oral
  • Adrenergic beta-3 Receptor Agonists*
  • Alkylation
  • Amines / chemical synthesis
  • Amines / chemistry
  • Animals
  • Benzoic Acid / administration & dosage
  • Benzoic Acid / chemical synthesis
  • Benzoic Acid / chemistry*
  • Benzoic Acid / pharmacokinetics*
  • Biological Availability
  • Biphenyl Compounds / chemistry*
  • Cross-Linking Reagents / chemistry
  • Dogs
  • Haplorhini
  • Humans
  • Microsomes, Liver / drug effects
  • Molecular Structure
  • Rats
  • Receptors, Adrenergic, beta-3 / metabolism
  • Structure-Activity Relationship


  • Adrenergic beta-3 Receptor Agonists
  • Amines
  • Biphenyl Compounds
  • Cross-Linking Reagents
  • Receptors, Adrenergic, beta-3
  • diphenyl
  • Benzoic Acid